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Employee Benefit Plans Employee Benefit Plans - Employee Stock Purchase Plan, Incentive Bonus Plan and Stock-Based Compensation (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Discounted Price For Purchasing Company's Common Stock 85.00%    
Employee Stock Purchase Plan, Maximum Percent of Annual Compensation 15.00%    
Fair Market Value Of Common Stock Available For Purchase To Eligible Employees Maximum $ 25,000    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 159,460 137,347 143,960
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 18,100,000 $ 15,300,000 $ 11,000,000.0
Salary and Wage, Officer, Excluding Cost of Good and Service Sold $ 22,500,000 $ 29,900,000 $ 35,400,000
Shares available for grant 20,200,000    
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for future issuance, shares 2,100,000    
Share-based Payment Arrangement [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for future issuance, shares 22,100,000